"known as the Jacks of All Trades"

The author's use of the name Jack may be a wink at the Jacquerie, a fourteenth century revolt by French peasants which became a term used of all peasant revolts.

French nobility in the pre-revolutionary period often referred dismissively to all peasants as "Jacques". This exacerbated the tensions between the classes that were a cause of the revolts.

In Dicken's A Tale of Two Cities, which is set at the time of the French revolution, three nefarious low born revolutionaries share the name Jacques.